Jefferson chase



(No Model.)

J. CHASE.

SPROGKET WHEEL.

No. 394,335. Datented Dec. 11, 1888.

l A l am anton.

SH01 mi? UNITED STATES PATENT OEEICE.

JEFFERSON CHASE, OF PORTLAND, MAINE, ASSIGNOR TO CHASE d' SON, OF SAME PLACE.

SPROCKET-WHEEL.

SPECIFICATION forming part of Letters Patent No. 394,335, dated December 11, 1888.

Application filed August 6, 1888. Serial No. 282,045. (No model.)

To all 'wh/0m t may concern,.-

Be it known that I, JEFFERSON CHASE, a citizen of the United States, residing at Portland, in the county ot" Cumberland, State of Maine, have invented certain new and useful Improvements in Spi'oeket-Vtlheels, ot' which the following is a speciiication, reference being had therein to the accompanying draw ings.

This invention has relation to sprocket'- wheels, and has tor its object a constrnctioll which will permit ot' the provision of steel teeth for the same and yet permit ot access to the parts otthe wheel for lfinishing purposes, whereby the article when completed shall be compact, serviceable, and adapted to be manufactured at a minimum cost.

Other objects and advantages ot the inven tion will hereinafter be described, and the novel teatures thereot' will be particularly pointed out in the claim.

Referring to the drawings, Figure l is a perspective, Fig. 2 a vertical transverse sec tion, and Fig. a partial side elevation, of one ot' the two parts ot the wheel.

Like letters refer to like parts in all the figures.

The wheel comprises two casty sections, A A, each ot' which is providedwith a hub, A', which is bored, as at A2, for the reception ot' a shaft or spindle. Each section is bound by a thick annular rim, A3, and perforated between the hub and rim for the passage of bolts B. The inner tace, A4, of each section is preferablytiat, being produced either in the casting or by any desired manner of planing',

bar of steel beveled at one end, as at C', while at the other it may be extended in any direction to form a projection, O2, or it may be notched, as at C3, so that when in any` manner it is provided with projections or notches the metal of the castin will set around the teeth and thus further a permanent solid connection ot the teeth and the section.

After the sections are cast and squared up on their faces A, the bolt-holes, if not produced in the process ot casting, maybe bored, and the two sections may then be bolted together, when the hub portion ot' the wheel may be bored or reamed to the desired size, and the wheel then mounted on a mandrel, and the quarter-grooves Af turned or otherwise brought to a true circle about the center et' the bore. At the same time, it necessary or desirable, the inner edges ot the teeth may be trued.

It is apparent that in use the links of the S1i)rocketchain employed in connection with a wheel ot' this construct-ion will take draft' against' the steel, or other hard-metal teeth employed, thus increasing the life of the wheel far beyond one in which the teeth are formed ot cast-iron.

l am aware that it is customary to substi tute harder metals tor softer in parts of maehinery subjected to a greater wear than remaining parts, and I do not claim, broadly, such a substitution ot' material as of my invention. In this case not only are the actual working-t'aces ot the teeth ot a sprocketwheel ot' a harder or more serviceable material, but said teeth are so located that .their inner edges, as well as their working faces or sides, project from the softer metal in which they are embedded, so that the actual chaingroove ot' the wheel-that is, the two quartergrooves Al-are strengthened against wear at all points in the periphery of the wheel where the teeth are located.

lVhat l claim is- A sprocket-wheel made in sections, each having at one side a hub and rim'and at the other side a 4plain face, a quarter-groove, and embedded steel teeth, substantially as speci tied.

In testimony whereof I affix my signature in presence of two witnesses.

JEFFERSON CHASE.

lllitnesses:

PHILTP W. HUsToN, FEED. M. Hannon. 

